<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        body {
            /*2*left+right*/
            min-width: 600px;
        }
        div {
            height: 100px;
        }
        #left,#right {
            background: pink;
        }
        #middle {
            background: deeppink;
            padding: 0 200px 0 300px;
        }
        #left {
            width: 300px;
            position: absolute;
            left: 0;
            top: 0;
        }
        #right {
            width: 200px;
            position: absolute;
            right: 0;
            top: 0;
        }
    </style>
</head>
<body>
    <div id="left">left</div>
    <div id="middle">middle</div>
    <div id="right">right</div>
</body>
</html>
